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    SubjectRe: P6 NOPs again: MPSC?
    On Mon, 10 Mar 2008, H. Peter Anvin wrote:
    > Hugh Dickins wrote:
    > >
    > > I'm suspecting that the patch below is actually wrong, and that it's
    > > really the "(X86_64 || !X86_GENERIC) &&" which should be changed;
    > > but very unsure of my ground and what's right for CPU_GENERIC -
    > > the 32/64 heritage of x86/Kconfig.cpu rather confuses me.
    > X86_64 && !X86_GENERIC comes from not wanting to be a compatibility issue when
    > compiling for generic CPUs. There are some 32-bit otherwise i686-compatible
    > chips (from VIA and Transmeta) which don't have these NOPs.

    Yup, I realized that (with || in place of &&): I meant that perhaps
    it was supposed to say X86_64 || (!X86_GENERIC && (M686 || ....))
    since quite a lot of other options there have "|| X86_64" to cover
    all the 64-bit possibilities at once i.e. is it only MPSC that
    needs to be added, or both MPSC and CPU_GENERIC?

    (But I've lost my way around here. A good example of the 32/64
    confusion is how one has to remember that X86_GENERIC is peculiar
    to 32-bit, and CPU_GENERIC peculiar to 64-bit. And CPU_GENERIC is
    understandably an alternative to the specific 64-bit models, but
    X86_GENERIC is strangely in addition to the specific 32-bit models.)


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